| Document And Entity Information | Jul. 09, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | CEN BIOTECH, INC. |
| Document, Type | 8-K/A |
| Document, Period End Date | Jul. 9, 2021 |
| Entity, Incorporation, State or Country Code | A6 |
| Entity, File Number | 000-55557 |
| Entity, Address, Address Line One | 300-3295 Quality Way |
| Entity, Address, City or Town | Windsor |
| Entity, Address, State or Province | ON |
| Entity, Address, Country | CA |
| Entity, Address, Postal Zip Code | N8T 3R9 |
| City Area Code | 519 |
| Local Phone Number | 419-4958 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | false |
| Amendment Description | Form 8-K/A date of report 07-09-21 |
| Amendment Flag | true |
| Entity, Central Index Key | 0001653821 |
